Laser distance finder

Abstract

A laser distance finder including a laser generating device, a collimating lens positioned in an emitting end direction of the laser generating device, a receiving lens for receiving a reflected measuring beam from an object to be measured and focusing it into an image, an optoelectronic detector disposed in the distance finder, a reflective member rotatably mounted on an optical path of the collimating measuring beam via a rotating shaft and being capable of rotating to a first position and a second position around the rotating shaft, which is connected to an output shaft of a motor. The laser distance finder further includes a spring, and the reflective member that rotates to a desired position rapidly and exactly by utilizing various deformation status of the spring, thus saving power.

I claim: 
     
       1. A laser distance finder, comprising:
 a laser generating device; 
 a collimating lens positioned in an emitting end direction of the laser generating device for converting a laser beam generated from the laser generating device into a collimating measuring beam; 
 a receiving lens for receiving a reflected measuring beam from an object to be measured and focusing it into an image; 
 an optoelectronic detector for receiving the image from the reflected measuring beam; 
 a reflective member rotatably mounted on an optical path of the collimating measuring beam via a rotating shaft, the reflective being capable of rotating to a first position and a second position around the rotating shaft, the rotating shaft being connected to an output shaft of a motor; 
 a spring having a first end and a second end, the first end connected to the reflective member and the second one end fixedly mounted in the distance finder; and, wherein the spring has a maximum deformation position between the first position and the second position. 
 
     
     
       2. A laser distance finder as claimed in  claim 1 , wherein the optoelectronic detector locates at a focus point of the receiving lens. 
     
     
       3. A laser distance finder claimed in  claim 1 , wherein the rotating shaft of the reflective member is connected to the output shaft of the motor directly. 
     
     
       4. A laser distance finder as claimed in  claim 1 , wherein the spring is an extension spring. 
     
     
       5. A laser distance finder as claimed in  claim 4 , wherein the rotating shaft of the reflective member locates between a position where the spring is connected to the reflective member and a position where the spring is fixedly connected to the distance finder. 
     
     
       6. A laser distance finder as claimed in  claim 1 , wherein the spring has a maximum deformation position in a bisector line of an angle defined by the first position and the second position of the reflective member. 
     
     
       7. A laser distance finder as claimed in  claim 6 , wherein the rotating shaft of the reflective member is a part of the reflective member. 
     
     
       8. A laser distance finder, comprising:
 a laser generating device; 
 a collimating lens positioned in an emitting end direction of the laser generating device for converting a laser beam generated from the laser generating device into a collimating measuring beam; 
 a receiving lens for receiving a reflected measuring beam from an object to be measured and focusing it into an image; 
 an optoelectronic detector for receiving the image from the reflected measuring beam; 
 a reflective member rotatably mounted on a rotating shaft of a motor, 
 a spring having a first end and a second end, wherein the first end is connected to the reflective member and the second end is fixedly mounted in the distance finder. 
 
     
     
       9. A laser distance finder of  claim 8 , wherein the reflective member is movable from an initial position between a first position and a second position based on a maximum deformation position of the spring. 
     
     
       10. A laser distance finder of  claim 9  wherein the reflective member is held in one of the first position or the second position by the spring.